Attribute Inspector, Attribute value popup dialogs

MacOS 10.12, Cubase 9.0.10

In MediaBay select any USER media item, like a VST preset for example.
Open Attribute Inspector, click “defined” (make sure that attribute “Family Name” is shown in the Attribute list) and click on the value cell for attribute “Family Name”
A dropdown list appears, click on “more…”
A dialog window appears, which is supposed to show ALL values for the Attribute, but the window appears to be empty: there’s the values text color white, the same as the windows background…